How many movies have Allan Melvin and Frank Welker acted in together?

They have worked on 3 movies together! Their first movie together was Hanna-Barbera's All-Star Comedy Ice Revue (1978) while their highest rated movie together was Scooby-Doo! in Arabian Nights (1994). They have not worked together since Scooby-Doo! in Arabian Nights (1994). They are most known for their animation films together.